8 INTKODUCTIOK. 



Thus to answer is very tedious. He concluded, there- 

 fore, to write this little book, which, being sold cheap, 

 might be in the hands of nearly everybody, and thus, 

 at little cost, give to all who wish it the desired in- 

 formation. The writer trusts that it will be received 

 as an humble contribution to a subject, which cer- 

 tainly is receiving, as it deserves, very general 

 attention. 



THE AUTHOR. 



